What would be the main reason of trying to withdraw the FUN tokens? If you have some left, I would just cash them out even the price you get per FUN tokens is a couple of satoshis.
Some people withdraw their FUN tokens probably because they can sell the tokens at higher price outside freebitco.
Currently, you can exchange each FUN token for $0.00433 at binance while the sell price on freebitco is 4 sat which is worth around $0.0038.